Process of bleaching barytes and recovering glauber salt.



Patented September 27, 1904.

UNITED STATES PATENT OFFICE.

WILLIAM D. GILMAN, OF SWEETW ATER, TENNESSEE.

PROCESS OF BLEACHING BARYTES AND RECOVERING GLAUBER SALT.

SPECIFICATION forming part of Letters Patent No. 770,963, datedSeptember 27, 1904.

Application filed December 28, 1903.

To all whom it mag concern.-

Be it known that I, WILLIAM D. GILMAN, a citizen of the United States ofAmerica, residing at Sweetwater, in the county of Monroe and State ofTennessee, have invented certain new and useful Improvements inProcesses of Bleaching Barytes and Recovering Glauber Salt, of which thefollowing is a specification.

The object of the invention is to accomplish the bleaching of barytes bythe use of a comparatively inexpensive substance from which a marketableby-product can be recovered.

In carrying out my invention I make a solution of niter-cake, aby-product from the manufacture of nitric and sulfuric acid. To thissolution crushed or ground barytes is added and the mixture heated untilthe iron and other soluble impurities of the ore are dissolved. Thesolution is run off and hot water added until the ore is properlywashed. To the solution run off from this treatment, as well as to thestronger wash-Water, an alkaline solution of sodium, as caustic soda, isadded until the solution is alkaline and the iron and heavier impuritiesare precipitated. It is then allowed to settle, and the clear solutionis concentrated by heat, if necessary, run into cool- Serial No.186,904. (No specimens.)

the byfor 3 the impurities; 4

wash-water an alkaline solution of sodium to 5A precipitate theimpurities and leave Grlaubei salt in solution; and finallyconcentrating the 45 resulting solution and allowing the Glauber salt tocrystallize.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM D. GILMAN.

Witnesses:

(J. E. YOUNG, G. M. MoKNIeH'r.

